*On MSNBC's "Morning Joe," Howard Wolfson defended -- against Scarborough and Co.'s relentless chiding -- Mark Penn replacement Geoff Garin's appearance on "Meet the Press" yesterday:

"He is new to the campaign," Wolfson said. "He is our fabulous chief strategist and it is important for him to go out on "Meet the Press" for us. And i thought he did a great job. David [Axelrod] was very feisty. And i think it's in keeping with the kind of campaign Sen. Obama has been running in Pennsylvania these last few days. They have turned very, very negative. So negative in fact that the press is reporting today that the Obama campaign is doing everything it can to spend as much money as it can to spread as much negative information as it can about Sen. Clinton here in the closing days of Pennsylvania."

On Gallup's national tracking poll showing a 13-point swing for Clinton: "The fact is that Sen. Clinton had lost this one much ground in the course of a week, there would be endless front page stories and endless television stories about what happened."

Discussing electability: "[John] McCain is a formidable political figure, which is why Democrats need to nominate the best candidate we can. If you look at the polling, Sen. Clinton matches up much better against McCain."

"If [Obama] is unable to beat Sen. Clinton in Pennsylvania," said Wolfson, "this will be yet another key state swing state that he has lost. It would raise questions yet again about his ability to go up against John McCain as our most effective nominee in November."

Update: Here's a clip:

*David Axelrod, appearing after the commercial break, responded:

"These polls bounce around, that's the nature of these things. I'm not concerned about that. If I was concerned about national polls, I would have been hiding under my desk seven months ago. We're fighting hard in Pennsylvania against big odds."

*On NBC's "Today", Andrea Mitchell began with a report from Pennsylvania, stating that if Hillary loses the race will likely be over. Newsweek's Howard Fineman told Matt Lauer that compared to six weeks ago after the Mississippi Primary, the conversation now is all about Obama who many voters still don't know a lot about:

* Also on "Today," Chuck Todd said that Pennsylvania's culturally conservative Democrats will vote for Clinton but turnout is key and many of these voters may not vote at all:

* On CBS's "Early Show," Joe Trippi played up the importance of tomorrow night's results, saying everything hangs on what happens in Pennsylvania:

* On Fox News' "Fox and Friends," Gov. Mike Huckabee said that John McCain is smiling for a reason: "He is very grateful to Sens. Obama and Clinton for the incredible fratricide they seem intent on in the Democratic Party. It is good for John McCain."

Huckabee outlined two things that are going in McCain's favor: 1.) "His own message [on the economy] is getting through." And 2.) "He's enjoying a smooth sail down the river while the rough waters are on the other side between Obama and Clinton."

On which candidate Republicans prefer: "There have been some recent things with Obama that cumulatively could hurt him in the fall. I think Sen. McCain is in the strongest position against either."

*ABC's "Good Morning America" began with Jake Tapper reporting from Pennsylvania on how the candidates are using every medium possible to contact primary voters. Tapper noted how late deciding voters have generally broke for Clinton, yet this time the candidates are tearing each other down like never before. Tapper also explained how Clinton has been on the attack after Obama's comments that McCain would make a better President than President Bush and Obama's equally strong response highlighted by the quote, "What kind of inspirational message is that?"

(Gregory Bobrinskoy contributed to the Morning Roundup.)